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Find the sum of first 51 …

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Find the sum of first 51 terms of an A.P.whose second and third terms are 14 and 18 respectively

    • Posted by Sujal Sanodiya 5 years, 3 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

     

    given,
    a2=14 
    a3=18 
    d=a3−a2=4 
    a1=a2−d 
    a1 =14-4
    a=10
    Sn=n/2(2a+(n-1)d)
     Sn=51/2(2*10+(51-1)4)
     Sn=5610

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